Five-Element Imaging Lens Compact Length Aberration Control
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Solution Overview
Problem
Conventional imaging lenses for portable electronic devices face challenges in reducing overall length while maintaining good optical performance, often compromising imaging quality due to their relatively large size.
Innovation Solution
An imaging lens design with five lens elements, each with specific refracting powers and surface configurations, including aspherical surfaces, optimized optical parameter relationships, and a compact arrangement to achieve a shorter overall length without compromising optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the overall length of the imaging lens is reduced, then the imaging lens becomes suitable for miniaturized portable electronic devices, but the optical performance and imaging quality are compromised
Solution Approach 1:
The imaging lens is divided into five separate lens elements (first, second, third, fourth, and fifth lens elements) with different refracting powers. This segmentation allows each lens element to be optimized for specific optical functions while maintaining a compact overall structure, resolving the contradiction between reduced length and maintained optical performance.
Solution Approach 2:
Each lens element is assigned specific local characteristics: the first lens element has positive refracting power with a convex object-side surface, the second and third lens elements have negative refracting powers, the fourth lens element has positive refracting power with a convex image-side surface, and the fifth lens element has negative refracting power with a concave image-side surface. This local optimization of optical properties enables compact design while preserving overall optical performance.
2Length of stationary object
If five lens elements with positive, negative, and positive refracting powers are arranged to reduce overall length, then the imaging lens becomes more compact, but the complexity of the lens structure increases
Solution Approach 1:
Multiple lens elements with different refracting powers are combined in a single compact imaging lens assembly. The first, second, third, fourth, and fifth lens elements are arranged in sequence along the optical axis, merging their individual optical functions into one integrated system that achieves both compactness and acceptable structural complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The imaging lens achieves a system length of below 4 mm while maintaining relatively good optical performance, including reduced aberration and chromatic aberration, suitable for miniaturized portable electronic devices.
Implementation Method 1
The first lens element has a positive refracting power, and the object-side surface thereof is a convex surface. The second lens element has a negative refracting power, and the image-side surface thereof is a concave surface.
Data Source
AI summary
An optical imaging lens includes, from an object side to an image side, an aperture stop, first, second, third, fourth, and fifth lens elements. The first lens element has a positive refracting power, its object-side surface has a convex portion in a vicinity of an optical axis, and its image-side surface has a concave portion in the vicinity of the optical axis. The second lens element has a negative refracting power, and its image-side surface is concave. The fourth lens element has a convex image-side surface. The object-side surface of the fifth lens element has a convex portion in the vicinity of the optical axis, and the image-side surface of the fifth lens element has a concave portion in the vicinity of the optical axis.